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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Nov 28, 2008 11:44 pm Post subject: |
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I think this is a neat comparison as well, High Power is on the left and Video Spectra 1.5 is on the right.
With the camera centered on the screen at proper eyelevel for the high power the HP is much brighter
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Zebu Fellenz
Joined: 21 Dec 2006
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| Posted: Fri Nov 28, 2008 11:46 pm Post subject: |
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But when the camera is on the side of the screen ~4' off center the 1.5 gain Video Spectra is brighter. This really goes to show how quickly the HP gain drops off.
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MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
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| Posted: Fri Nov 28, 2008 11:51 pm Post subject: |
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| Zebu Fellenz wrote: | | But when the camera is on the side of the screen ~4' off center the 1.5 gain Video Spectra is brighter. This really goes to show how quickly the HP gain drops off. |
That is interesting....What angle would you think you were at on the second image?
Mike
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Zebu Fellenz
Joined: 21 Dec 2006
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| Posted: Sat Nov 29, 2008 12:05 am Post subject: |
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| MikeEby wrote: | | Zebu Fellenz wrote: | | But when the camera is on the side of the screen ~4' off center the 1.5 gain Video Spectra is brighter. This really goes to show how quickly the HP gain drops off. |
That is interesting....What angle would you think you were at on the second image?
Mike |
I know I was outside of the 30 degree viewing cone of the HP, I'd guess about ~35 degrees off center.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Sat Nov 29, 2008 4:50 am Post subject: |
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> I know I was outside of the 30 degree viewing cone of the HP, I'd guess about ~35 degrees off center. <
Interesting guesstimate. You must have moved in closer than your initial "The seats are about 15' from an 8' wide screen" then, because 4' off axis at 15' would only be 15-deg. For 35-deg, you'd have to go to 10.5'.
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Sat Nov 29, 2008 5:34 am Post subject: |
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| VideoGrabber wrote: | > I know I was outside of the 30 degree viewing cone of the HP, I'd guess about ~35 degrees off center. <
Interesting guesstimate. You must have moved in closer than your initial "The seats are about 15' from an 8' wide screen" then, because 4' off axis at 15' would only be 15-deg. For 35-deg, you'd have to go to 10.5'. |
Yes I did move closer, sorry for leaving that out.
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Sat Nov 29, 2008 6:06 am Post subject: |
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That's OK, Erik. Just give us all the facts. 
~35 deg off-center implies you moved in to a little under 6 feet. Does that sound about right?
Interestingly, that VideoSpectra piece seemed to maintain its gain pretty well.
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Sat Nov 29, 2008 7:20 am Post subject: |
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That sounds about right. Yes the video spectra maintained gain very well with a wide viewing cone.
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armstrr
Joined: 26 Mar 2006
Posts: 160
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| Posted: Sun Nov 30, 2008 2:39 pm Post subject: |
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the only true way to evaluate is...is to have a full screen. just the fact that i can leave my contrast at 50ish on a 9' wide screen says a lot
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Sun Nov 30, 2008 10:07 pm Post subject: |
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> [iI know I was outside of the 30 degree viewing cone of the HP, I'd guess about ~35 degrees off center.[/i] <
Just a quick comment... the HP isn't designed for that far off-axis viewing. It's below unity-gain at that point, which you can see in comparison with the paint.
However, if you'd been 4' off axis at your original 15' viewing position (instead of moving in close to <6' from the screen), that would only be ~15-deg, and you'd still have some gain.
> Yes the video spectra maintained gain very well with a wide viewing cone. <
I've never seen one, but wonder why they're not more popular with CRTers. Their specs would indicate a good set of design parameters.
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Nashou66
Joined: 12 Jan 2007
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Thu Jan 01, 2009 6:26 pm Post subject: |
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Guys,
Just wanted to give an update that my new screen arrived yesterday (late x-mas gift). It is a Da-lite Model C pulldown with High Power Fabric 54x96. The best way I can describe this screen is as a poor mans stack. IMO if you can do the seating right (close to the lightsource) it is an excellent screen. I'll be sure to get some screenshots up soon.
Erik
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schmoe
Joined: 30 Mar 2008
Posts: 374
Location: Seattle, WA
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| Posted: Fri Feb 06, 2009 12:52 am Post subject: |
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"poor man's stack" ?? Please elabrote. And post pics!
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Feb 06, 2009 12:57 am Post subject: |
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High power screens have color shift unless your right in the narrow view cone usually 15 degrees for High Power screens. Go with the da Lite 1.3 gain it isn't a bad screen.
Poor mans stack means he doenst need another PJ. Just the 2-3 gain screen. Personaly I don't like them, but many here swear by them. If your the primary viewer and sitting right next to the PJ then it will be very bright and look great move off to one side a few feet and you loose the punch and colors . I tried one for about a week and took it back.
Athanasios
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Feb 06, 2009 1:12 am Post subject: |
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| schmoe wrote: | | "poor man's stack" ?? Please elabrote. And post pics! |
For my usage it is the screen to have. It is uber bright with great edge to edge uniformity and the screen material has no visible texture. The screen does have color shift but when it shifts the entire screen shifts at once so you will never end up with one side being blue and the other red. The color shift doesn't bother me but ymmv.
You also really need to build your projector around the screen for optimal results. for me this meant flipping my room 90 degrees and mounting my G70 so the lenses are only about 1' above my head when seated. This minimizes the angle between the projection and viewing to help get the most gain out of the screen.
I will try to get some pics later tonight or tomorrow.
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schmoe
Joined: 30 Mar 2008
Posts: 374
Location: Seattle, WA
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| Posted: Fri Feb 06, 2009 1:20 am Post subject: |
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Hmm, sounds like probably not a good option for me, but I'll definitely be giving it a look-see when the samples arrive. Thanks for the review. Looking forward to the pics.
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Feb 06, 2009 1:28 am Post subject: |
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I really got to get a highpower going. My Ampro is about 12-18 inches over my head when seated.
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Feb 06, 2009 1:31 am Post subject: |
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| AnalogRocks wrote: | | I really got to get a highpower going. My Ampro is about 12-18 inches over my head when seated. |
Sounds like the ideal setup. Just be careful all that light might scare the Ampro to death (again) 
Ask Da-lite for the larger size sample and see how it compares.
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Feb 06, 2009 1:34 am Post subject: |
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Shhhhh I haven't powered the old 3 eyed boy on for a week. Too bussy. Don't scare him. I wana watch the Queen Bluray I picked up tomrorow night. 
What's the gain numbers on the highpower? Hmm I wonder what a 10.5 x 8 screen would cost in HP?
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